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Added the CRC of the joystick name to the GUID

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This will make it possible to have mappings for different controllers
that have the same VID/PID. This happens frequently with some generic
controller boards that have been reused in many products.

Fixes https://github.com/libsdl-org/SDL/issues/6004
This commit is contained in:
Sam Lantinga
2022-08-22 16:46:55 -07:00
parent 20715fa014
commit c1e0873940
21 changed files with 179 additions and 117 deletions
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2
src/joystick/linux/SDL_sysjoystick.c
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@@ -241,7 +241,7 @@ IsJoystick(const char *path, int fd, char **name_return, SDL_JoystickGUID *guid)
/* We only need 16 bits for each of these; space them out to fill 128. */
/* Byteswap so devices get same GUID on little/big endian platforms. */
*guid16++ = SDL_SwapLE16(inpid.bustype);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(SDL_crc16(0, name, SDL_strlen(name)));
if (inpid.vendor && inpid.product) {
*guid16++ = SDL_SwapLE16(inpid.vendor);